Engineering Calculation Tools
Web tools and engineering services for seismic anchor calculations and seismic anchorage calculations — also referred to as anchor seismic calculations or anchorage calculations — equipment anchorage design, and vibration isolator selection, all backed by PE/SE stamped review.
Includes seismic anchor bolt calculation, anchor bolt design, and anchor bolt calculation per ACI 318-19 Chapter 17 — bolt sizing, embedment, edge distance, and tension–shear interaction.
SDS, Ip & z/h Input Tool
Public ASCE 7-22 input tool for SDS lookup workflow, importance factor I_p, z/h ratio, and CAR / Rpo / Ω0 selection from Chapter 13.5-1 and 13.6-1.
Open free toolSeismic Force (Fp) Calculator
Compute the ASCE 7-22 §13.3 component seismic design force Fp with full Hf, Rμ, CAR, Rpo, Ω0, Fp,min/Fp,max checks. Generates a compact PE/SE-style review report with all calculations shown.
Open Fp calculatorASCE 7-22 Equipment Anchor Calculator
Compute Fp, Fv, anchor tension and shear for any nonstructural component under ASCE 7-22 Chapter 13. Authorized-user web tool with PE/SE-stampable output.
Open the calculatorAnchor Bolt Interaction Worksheet
Tension–shear interaction per ACI 318-19 §17.8 with Ω0 amplification, edge-distance reduction factors, and cracked/uncracked toggles.
Request worksheetSSI-Series Isolator Selector
Match equipment weight and operating speed to the correct color-coded SSI-2SR isolator with built-in seismic restraint.
View isolatorsStamped Calculation Request
Submit your equipment data sheet, anchor pattern, and project criteria — receive a PE/SE stamped seismic anchor calculation package.
Submit for reviewWhy use a dedicated seismic anchor calculator?
Generic structural software rarely captures the full ASCE 7-22 Chapter 13 force chain — Hf, Rμ, CAR, Rpo, the Fp,min floor, the Fp,max ceiling, ±Fv combination, the Ω0 amplification on concrete-controlled anchors, and the orthogonal-direction check. Our calculator bakes in the 2025 CBC parameters and outputs a clean, stamp-ready calculation sheet.
Start with SDS, Ip, and z/h
Many users are not ready for a full anchor design on the first visit. They begin by finding SDS from the ASCE Hazard Tool, confirming whether Ip = 1.0 or 1.5, calculating z/h from building height and component elevation, and identifying the right CAR, Rpo, and Ω0 row from ASCE 7-22 Tables 13.5-1 and 13.6-1. Our new public SDS, Ip & z/h calculator supports that earlier-stage workflow and helps project teams move faster into a stamped seismic calculation.
Methodology
The calculator follows the workflow documented in our Equipment Anchorage Design page: derive seismic demand, build the free-body diagram, resolve into per-anchor tension and shear, check ACI 318-19 Chapter 17 limit states (steel, breakout, pullout, blowout, pryout), apply the §17.8 combined-load interaction, and output a DCR table with the governing limit state called out.
Looking for worked examples?
See Anchor Bolt Design Examples for three fully worked anchor seismic calculations, or ASCE 7-22 Chapter 13 Guide for a deep dive into the Fp equation that drives every seismic anchor calculation.
Anchor seismic calculations, seismic anchorage calculations & anchorage design — same workflow
Engineers and contractors use both phrasings interchangeably: anchor seismic calculation, anchor seismic calculations, seismic anchor calculation, seismic anchor calculations, seismic anchorage calculation, anchorage calculations, and equipment anchorage design all refer to the same ASCE 7-22 Chapter 13 / ACI 318-19 Chapter 17 design workflow: derive Fp, resolve into per-anchor tension and shear, apply Ω0, check steel/breakout/pullout/blowout/pryout limit states, and verify the §17.8 combined-load interaction. Whether you searched for anchor seismic calculations, seismic anchor calculations, anchorage calculations, or equipment anchorage design, the deliverable is the same — a PE/SE stamped calculation package.
Seismic anchor bolt calculation, anchor bolt design, and anchor bolt calculation
When the attachment to concrete is a bolt — cast-in headed anchor, post-installed expansion anchor, screw anchor, or adhesive anchor — the deliverable is a seismic anchor bolt calculation. The anchor bolt design selects diameter, embedment depth hef, edge distance ca1, and center-to-center spacing s so the anchor bolt calculation passes every ACI 318-19 Chapter 17 limit state: steel tension, steel shear, concrete breakout, pullout, side-face blowout, and pryout. The §17.8 combined tension–shear interaction is then verified for the governing limit state. Concrete-controlled checks include the Ω0p over-strength amplification per ASCE 7-22 §13.4.2 and the seismic 0.75 reduction per ACI §17.10.6.
Search terms like seismic anchor bolt calculation, anchor bolt design, anchor bolt calculation, and seismic anchor calculations all describe the same PE/SE stamped deliverable PANACHE ENGINEERING produces — a complete calculation package with the governing limit state and DCR called out per anchor.